Supporting swa's running in box section?

[James]

I want to know if it's ok to run swa inside a mild steel 200x200 box-section, I think the main issue is support.
the length of the run is 5 meters vertically. i can support the cable at the top and bottom but not any where else.

 

[pennywise]

Page 111 of the onsite guide may be useful, bullet point 2 and 6. cheers